update readme for external linters update
rework imports and module reloading
add __all__ to lint.__init__
remove outdated TODO
update commands import
fix scoped linters
fix some issues when using overlapping linters
rename Preferences commands
add note about subclassing inside plugin_loaded
fix incorrect scoped linter messages
fix exception with no selection
fix regression in linting
imply SublimeLint prefix on persist.debug()
add external linter downloader/updater